Iodin compound and process of making same.



- UNITE STAT S PATENT Fries. I

ALEXANDER OLASSEN, OFAIX-LA-OHAPELLE, GERMANY.

IODIN COMPOUND AND PROCESS OF MAKING SAME.

SPECIFICATION forming part of Letters Patent No. 627,981, dated July 4, 1899. Application filed October 29, l894 SerialNo. 527,118. (Specimena) T0 all'whom it may concern: 7

Be it known that I, ALEXANDEROLASSEN, professor and doctor of philosophy, a subject of theKing of Prussia Emperor of Germany, residing-at Aix-la'Ohapelle, in the Kingdom of Prussia, Germany, have invented newand useful Improvements in the Manufacture or Production of Chemical Oompoun ds'Con tain-' ing Iodin, (forwhich I have obtained Letters Patent in Germany, No. 85,930, datedMay27,

1894,) of which the followingis a specification: Iodin derivatives of phenols have already been produced ingreat number. Ihave discovered that new iodin compounds are ob-f t'ainable which are also capable of pharmaceutical application if the phenolphtalein is treated in a suitable manner with iodin or substances yieldingiodin.

According to my investigations the 11915151 phtalein can be readily converted into iodin derivativesby solution in alkaliesor salts,

' addition of iodin, and 'precipitationofthe products by means of acids. The iodin com-i pounds thus obtaineddiffer from the iodin derivatives hitherto produced from the oXy bodies by the fact that by the entrance of all the iodin bodies into the benzene nucleizthe hydrogen atoms of the hydroxyl groups 'remain free and give the resulting compounds the character of strong acids. The iodin derivatives of these aromatic oxy bodies hitherto produced in alkaline solution are without any exception insoluble in alkalies, and the reason of this insolubility consists in the presence of iodin oxy compounds. The proof that in the case of the iodin derivatives of.

phenolphtalein all the iodin atoms are in the nuclei consists not only in their acid nature,

but also in the tetrame'trical determination of the number of the hydroxyl groups, from which it resulted that in the case of the iodin compounds obtained their number is always equal to that of the original matters. Another proof for this position is their behavior in the presence of acetic anhydrid. While it has been shown that phenolphtalein is converted by boiling for several hours on the reflux cooler with acetic anhydrid into the corresponding diaceto compo unds,which by boiling with soda-lye are reconverted into the original iodin compounds, the action of the acetic anhydrid on halogen oyxl compounds takes place in quite a different manner.

group is separated with the formation of an Either the iodin contained in the hydroxyl acetyl derivative containing correspondingly 7 less iodin atoms or the iodin atoms are transposed into the nucleus. -Moreover, all the halogen oxyl compounds are completely in- 1 6o.

soluble in alkalies and show only little resistauce. On the contrary, the iodin compounds ofv the' phenolphtalein substituted in the'nu-f cleus can be treated with boiling soda-lye Without decomposing them. The acid nature enables'them, moreover, to form salts *With lightand heavymetals.

. The iodin can be employed'either dissolved ina solution of potassium iodid or in any other' suitablesolvent, or itmay be employed in the form of iodids'with the addition of stance, 'chlorid the like;

*agents capable of liberating iodin-for inof lime, chlorin, bromin, or

v According to my researches the electric cure rent can also be'usedmore profitably in order to liberate iodin from the iodids. .Iodin chlorid' orthe com-bination'of iodin chlorid and muriatic acid or the like agentscan be used in place of iodin for producing the iodin compounds from the said hydroxyl products or secondary'amins or the like.

The production of the iodin compounds hereinbefore defined is illustrated by the following-examples. The parts are byweight.

1. Process for Preparation of Tctmiodophe nolphtale'in.

(a) Under cooling-Thirty grams phenolphtalein are dissolved in one hundred grams Water containing forty grams sodium hydrate. To this is addedfa solution of one hundred grams iodin and one hundred and twenty grams potassium iodid in four hundred grams Water, the temperature of which must not exceed 20 centigrade. The red color of the alkaline phenolphtalein solution is during this process changed into a deep blue. The solution is then well cooled, and cooled hydrochloric acid is added. An amorphous yellowish-browri body isprecipitated,which by thoroughly Washing with a solution of potassium iodid and water can be perfectly purified. If the moist precipitate is raised to a higher temperature,-(about 100 centigrade,) itis converted into a white bodynamely, tetraiodophenolphtalein plus one molecule of water.

It is purified by solution of the undried precipitate in chloroform and precipitation with ligroin, and after drying in vacuo it is obtained as a yellow powder devoid of odor and is perfectly permanent in light and air. The analysis gives Calculated for O I-I I O H O; 1260.4 per cent. Found: 1:60.05 per cent.

The conditions as to solubility and other properties agree with those of the white tetraiodophenolphtalein,which is at once obtained.

(1)) By heating.'lf after adding the iodin the deep-blue solution be heated for some time on a steam-bath, the color changes into ayellowish-browntint. If hydrochloric acid .1 be added,a gray-white bodyis precipitated,

which by thoroughly washing or also by dis solving in soda-lye and precipitating with acids is obtained in'a white condition as tetraiodophenolphtalein. It musttherefore be assumed that with the body produced. in the cold and having an additional molecule of water the lactone formation is destroyed. In the same way that the yellow body can be converted into the white the reverse operationcan be effected. If the white tetraiodid of phenol phtalein is dissolved in the cold in sodalye and hydrochloric acid is added under cooling, the first-described yellow body is precipitated. After heating with soda-lye until the color changes the white compound is again obtained by means of hydrochloric acid.

The tetraiodophenolphtalein is insoluble in water and ligroin. vents underhea'ting it is easily soluble, but

with greater difficulty in cold solvents. It is most readily taken up by warm chloroform. It, is insoluble in acids and readily soluble in ale kalies. It is distinguished by perfect absence of odor, and it is quite permanent when exposed to light and moisture. The analysis gives the formula: G H l O,.

T 1 Per cent. Per cent. Calculated: I=61.7 0:29.21; I-I=1.22. Found: 1:61.92; (3:29.23, H:1.53.

Electrolyttcal production.Thirty grams phenolphtalein are dissolved in one hundred grams water containing thirty-five grams sodium hydrate. To this is added one hundred and forty grams potassium iodid in two hun- -dred grams water, and it is subjected to electrolysis for some hours with a current of about 1.5 amperes. The change of color shows the end of the reaction. It is then heated until the blue tint has changed into brownish yellow, and the tetraiodophenolphtalein is precipitated with hydrochloric acid.

Process for the Production of Salts of Tetratodophenolphtalein.

The salts can be obtained'both from the brown and from the white body. They are easily obtained in a pure condition by reacting upon the soda salt of the tetraiodophenolphtalein with the chlorids or other soluble In the other organic'sols Per can t.

salts of the heavy metals. In this manner the aluminum, iron, zinc, lead, manganese, bismuth, and mercuric" salts have been produced and tested in a pure state in large quantities. The following example will illustrate the process:

Production of the Aluminum, Zinc, Lead, Iron, and lllanganese Salt.

Inad'dingtoasolutionofsaltsoftheabovementioned metals-such as aluminum, sulfate of zinc, sugar of'lead, crystallised ferrous 1 sulfate or iron-alum, manganous sulfate-1 am aqueous solution of the soda salt of about five per cent. a momentary transposing takes place. l U

The salts of the tetraiodophenolphtalein, which are completely insoluble in water, are

. precipitated. Whenthe blue colorof thesolution of the soda saltson the further addition to the solutions of the heavy metals becomes permanent, the reaction is finished.

The separated salts are filtered, thoroughly washed, and dried. The salts are in the form of brown or red-brown powders and are found by analysis to possess a normal composition,

so that the hydrogen atoms of the hydroxyl groups are substituted by a number of .metallic atoms corresponding to the qua'ntivalence of the metals.

The zinc salt is constituted as follows:

In an analogous manner there are formed lead and manganese salts and iron salt in using green vitriol.

In employing iron-alum there results the combination Production of the illercam'c and Bis-math Salt. The prod notion of these two salts differs in so far from the production above explained, as owing to the difficulty of dissolving or decomposing the ordinary salts in water the compounds of the chlorids with alkaline chlorids are used.

Mercury or bismuth chlorid is dissolved in ten parts of a saturated solution of common salt, and a one-per-cent. solution of the soda salt is allowed to flow into the solution until the supernatant liquid assumes the blue-solution color of the soda salt. The precipitate is then treated 'in the manner describedunder 1. Both the compounds form light-brown powders. Analyses give the normal composition1 a, for the mercury salt:

for the bismuth salt ed by light and moisture.

\ In order to produce salts,l do not limit myself to the particulars above given, as these can be varied. (The salts of the iodo-oxytriphenylmethane, 850., can be effected by means of all methods known and in use for analogous phenol salts.) The iodin products can be produced,in addition to the methods explained above, by means of iodin chlorid or the combination of iodin chlorid and muriatic acid or by other substances acting in an analogous manner.

In addition to the method of iodating in alkaline solution there may'advantageously be employed a new method of iodating not hitherto known. It consists, in place of iodating in a solution of soda or potash lye or ammonia, in bringing phenolphtalein dissolved in an aqueous solution of borates, biborates, phosphates, or pyrophosphates, in connection with free iodin in solution in iodid of potassium or in any other solvent for iodin or with potassium iodid or iodic acids with the employment of a medium for liberating the iodin. The general characteristic of the salt solutions employed for this purposeis, in addition to their solubility in water, their property of forming with phenolphtalein a soluble alkali salt. The iodating in this operation does, however, not take place in alkaline solution, as the acids contained in the above-named salts,being liberated by the action of the iodin, produce a perceptible acid reaction, and consequently effect the immediate separation of the tetraiodophenolphtalein. Such salts are the normal phosphates and borates, as also the pyrophosphates and biborates. The best suited for this purpose are the soda salts. rated by filtration is at once pure after one treating with steam, and the convenient means of purifying, in particular as compared with the tedious ones necessary with iodating in alkaline solution,is a great ad vantage when carrying out the process on a large scale.

I will give some examples of the process.

1 a: Twenty grams phenolph talein are dissolved under heating in three and one-half to four liters water containing four hundred grams borax in solution, (or any other biborate or borate,) and to this are added also under. heating a solution of ninety grams iodin salts with a medium that will liberate the iodin, (such as chlorin, bromin, chlorid of lime, 850.) After alkaline reaction of the liq uid the blue-solution color of the tetraiodophenolphtalein appears, which on further addition of iodin turns to yellow, the iodin beginning at thesame time to separate. Thereaction is completed when the liquid permanently assumes the iodin color. The filtered product of the reaction is freed in a current of steam from any remaining iodin and is then pure. The identity of the product with tetraiodophenolphtalein is determined by its characteristic reactions and also by the analysis.

1 b: In employing the same proportions the process can also be carried out by allowing the aqueous borax solution or a phenolphtalein solution containing another biborate, borate, phosphate, or pyrophosphate to flow slowly into the iodin dissolved in the iodidof-potassium solution, and then purifying, by means of steam, the tetraiodophenolphtalein, which is at once separated and filtered.

'II. Twenty grams phenolphtalein are dissolved, together with four hundred grams sodium pyrophosphate, (or any other pyrophosphate or phosphate soluble in water,) in three and one-half to four liters water, and this is added to a solution of ninety grams iodin and one hundred grams potassium iodid in one-half liter of water, under heating, either by adding the iodin-potassium-iodid solution according to 1 a or by pouring the phenolphtalein solution into the iodin-potassium-iodid solution according to 1 b. The separated tetraiodophenolphtalein is filtered and puritied in a current of steam.

As an example of the applicability of iodin properties of one of themname1y, of the tetraiodophenolphtaleinand of some of its salts will hereinafter be more fully described.

The tetraiodophenolphtalein is in particular qualified in the treatment of wounds as an excellent substitute for iodoform, it possessing greater antiseptic power and at the same timedoes not irritate and is free from odor and poisonous properties. Tetraiodophenolphtalein has also successfully been em The iodo derivative sepa-' ICO preparations for pharmaceutical purposes the ployed internally in doses of 0.3 grams for intestinal catarrh. Owing to its iusolubility in acids and its solubility in alkalies, this substance passes through the stomach without being dissolved and acts'only in solution in the alkaline contents of the intestines.

Soda salt is used as sprinkling-powder in the case of purulent sores-in particular in the case of soft chancres. In aqueous solution it is employed for moist bandages and tampons at a concentration of two per cent. For rinsing the bladder in bladder-catarrh a solution of two per cent. has given very excellent results. For healing diseases of the throat and ear solutions of from 0.1 to 0.5 per cent. are employed for gargling and rinsing.

Bismuth salt is employed, like the primiiive substance, internally and externally.

Mercury salt is used as sprinkling-powder in syphilitic diseases.

The examinations of other salts of the tetraiodophenolphtalein has given similar results.

What I claim as new isl. The herein-described process of obtaining iodin derivatives of the phenolphtaleins, containing the iodin in the benzene nuclei, which consistsin reacting with iodating agents upon a solution of phenolphtalein.

2. The herein-described process of obtaining iodin derivatives of the phenolphtaleins, containing the iodin in the benzene nuclei, which consistsin reactingwith iodating agents upon an alkaline solution of phenolphtalein.

3. The herein-described process of obtaining iodin derivatives of the phenolphtaleins, containing the iodin in the benzene nuclei, which consists in reacting withiodatin gagents upon a solution of phenolphtalein, and treating with an acid to precipitate the product.

4. The herein-described process of making the soda salts of iodin derivatives of phenolphtalein, containing the iodin in the benzene nuclei, which consists in reacting with iodating agents upon a solution of phenolphtahydroxid, and treating with a metallic salt.

ii. The herein-described process of making an iron salt of iodin derivatives of phenolphtalein, which consists in adding iodin in solution to a solution of phenolphtalein, treating with an acid, dissolving theprecipitate in water containing sodium hydroxid'and adding a solution of ferrous sulfate.

7. Tetraiodophenolphtalein, as a new product, the same being a white odorless powder melting at a temperature of about 220 centigrade, insoluble in water and acids, soluble with difficulty in alcohol and ether, more readily soluble in chloroform, very soluble in alkalies and forming with the same a blue solution; said product being adapted as an antiseptic in the treatment of wounds, the, substantially as described.

8. The herein-described odorless iodin compounds derived from phenolphtalein in the form of powders, generally insoluble in acids and solublein alkalies, having excellent anti septic properties, permanent in light and in moisture and having the general formula O IL LO in which the hydrogen atoms ofthe hydroxyl groups may be replaced by metallic atoms.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

ALEXANDER GLASSEN.

lVitnesses:

JOHN HEcKMANNs, WM. 0. EMMET. 

